A CT X-ray tube with a fixed spindle and a damper

Abstract

This invention discloses a CT tube with a fixed mandrel and a damper, belonging to the field of medical technology, aiming to provide a CT tube with long service life and good performance. The invention includes a tube housing, with a cathode, an anode target disk, and a rotor system respectively located at both ends inside the housing. The rotor system includes a rotor, a motor stator, a motor rotor, a stator outer sleeve, and a fixed mandrel. The fixed mandrel and the stator outer sleeve are connected by a damper. The stator outer sleeve has grooved metal bearings, and the rotor and the stator outer sleeve are lubricated with liquid metal. Because the liquid metal fills the bearing gaps, it has excellent heat transfer characteristics. This CT tube with a fixed mandrel and a damper improves the dynamic characteristics of the rotor system by adding a damper to the fixed mandrel, allowing the anode target disk to rotate stably, which helps maintain a constant focal position on the anode target disk, improving X-ray quality and the service life of the CT tube.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical machinery, in particular to a CT tube with fixed mandrel and damper. BACKGROUND

[0002] CT (Computer Tomography) is an electronic computer tomography, which uses precisely collimated X-ray beam, gamma ray, ultrasound, etc. with a highly sensitive detector to make one after another cross-sectional scanning around a certain part of the human body, and has the characteristics of fast scanning time and clear image, which can be used for the examination of various diseases.

[0003] The CT tube, also known as an X-ray tube, is the core component of the CT tube, which is used to generate X-rays. The CT tube includes a rotor and an anode target disc. Under high voltage, the cathode will generate a free electron beam to hit the anode, and at the same time, energy exchange will occur, which will convert 1% of the electrical energy into X-rays, and the rest will be converted into heat energy for heat dissipation, causing the temperature of the anode target disc and the rotor to be very high. A large amount of heat can easily cause the anode target disc to be scrapped. Currently, the rotor is driven by a motor to rotate the anode target disc at high speed, which can make the anode target disc and the rotor evenly heated. The anode target disc has a certain mass and is connected to the rotor for high-speed rotation.

[0004] In summary, the rotor system should have good dynamic characteristics to make the rotor and the anode target disc rotate stably, otherwise vibration will cause instability of the focal point, which is not conducive to heat dissipation of the anode target disc and affects the service life of the CT tube. SUMMARY

[0005] The purpose of the present application is to provide a CT tube with fixed mandrel and damper to improve the dynamic characteristics of the rotor system in the prior art and improve the stability and service life of the CT tube.

[0006] As conceived above, the technical solution adopted by the present application is:

[0007] A CT tube with outer rotor structure, comprising a tube shell, the inside of the tube shell comprising an anode target disc and a cathode, the CT tube comprising a rotating part, characterized in that: the rotating part comprises a rotor, a fixed mandrel, a motor stator, and a stator outer sleeve, the rotor is connected to the anode target disc through a fastener, the stator is arranged outside the tube shell and corresponds to the position of the rotor, and the rotor sleeve is outside the stator outer sleeve.

[0008] Among them, the rotor and the stator outer sleeve are provided with a radial bearing and a thrust bearing, and the rotor and the stator outer sleeve are matched through the radial bearing and the thrust bearing.

[0009] The radial bearing is engraved with a herringbone groove, and the thrust bearing is engraved with a spiral groove.

[0010] The rotor and the stator outer sleeve are sealed by a sealing ring.

[0011] The rotor and the stator outer sleeve are sealed by a sealing ring.

[0012] Three dampers are arranged between the stator outer sleeve and the fixed mandrel.

[0013] The dampers at both ends of the fixed mandrel are fixed on the stator outer sleeve and the fixed mandrel by bolts.

[0014] The damper in the middle of the fixed mandrel is fastened on the fixed mandrel by a nut and a clasp spring.

[0015] The stator outer sleeve and the fixed mandrel are provided with threaded holes.

[0016] The fixed mandrel is externally threaded.

[0017] The extension direction of the bolt is parallel to the axis direction of the rotor.

[0018] A cooling device is arranged between the stator outer sleeve and the fixed mandrel.

[0019] The stator outer sleeve is sealed by an outer sealing cover and an inner sealing cover.

[0020] The present application has the following beneficial effects:

[0021] 1. The CT tube provided by the present application adds dampers to the fixed mandrel, and coaxial stator outer sleeves are arranged on the outer surface of the fixed mandrel, and fasteners are used to connect the rotor and the anode target disc. The added dampers can improve the stiffness and damping of the bearing, thereby improving the dynamic characteristics of the rotor system, reducing the vibration of the rotor, and being beneficial to the uniform heating of the anode target disc and the clear imaging of the CT tube, and improving the stability and service life of the CT tube.

[0022] 2. The CT tube provided by the present application uses liquid metal between the rotor and the stator outer sleeve, which is beneficial to reducing the wear of the rotating shaft, absorbing the heat on the surface of the anode target disc, and improving the service life of the rotating shaft compared with the traditional ball bearing.

[0023] 3. The CT tube provided by the present application is provided with an outer cooling channel between the stator outer sleeve and the fixed mandrel, which greatly improves the heat transfer of the CT tube and prolongs the service life of the CT tube. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1The CT tube internal structure schematic diagram provided for the present application example;

[0025] Figure 2 The internal damper and external damper schematic diagram added to the present application;

[0026] Figure 3 The middle damper schematic diagram added to the present application;

[0027] Figure 4 The stator outer sleeve structure schematic diagram of the present application.

[0028] In the figure:

[0029] 1, shell; 2, anode target disc; 3, rotor; 4, sealing cover; 5, bolt; 6, nut; 7, stator; 8, motor rotor; 9, radial bearing; 10, outer sealing cover; 11, cooling working medium outlet; 12, fixed mandrel; 13, cooling working medium inlet; 14, external damper; 15, sealing ring; 16, stator outer sleeve; 17, middle damper; 18, circlip; 19, thrust bearing; 20, internal damper; 21, cathode DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0031] Embodiment one:

[0032] Please refer to Figure 1 The present application provides a CT tube with fixed mandrel and damper, which comprises a tube shell 1, the inside of the tube shell 1 is in a vacuum state, the inside of the tube shell 1 is respectively provided with a cathode 21 and an anode target disc 2 at two ends, the anode target disc 2 and the cathode 21 are respectively connected to the positive and negative poles of a power supply to generate a high-voltage electric field, the CT tube rotor system comprises a fixed mandrel 12, a rotor 3, a motor stator 7 and a motor rotor 8, the rotor 3 is fixedly connected to the anode target disc 2, the motor stator 7 is arranged outside the tube shell 1 and corresponds to the position of the rotor 3, the motor stator 7 has a winding, current flows through the motor stator winding to generate a rotating magnetic field, which drives the rotor 3 to rotate and drives the anode target disc 2 to rotate, the rotor 3 and the stator outer sleeve 16 are matched through the radial bearing 9 and the thrust bearing 19, and then liquid metal lubrication is adopted to ensure low rotation wear of the rotating shaft and high heat transfer efficiency.

[0033] The damping device is arranged between the fixed mandrel 12 and the stator outer sleeve 16, so that the stiffness and damping of the bearing are ensured, and the dynamic characteristics of the rotor system are improved.

[0034] Embodiment two:

[0035] Please refer to Figure 2 , Figure 3 wherein Figure 2 is a schematic view of the middle damping device 17, the middle damping device 17 is fixed on the fixed mandrel by the external thread on the fixed mandrel and the nut 6, and the axial displacement of the middle damping device 17 is limited by the circlip 18, so that the middle damping device 17 is fixed and installed; Figure 3 is a schematic view of the internal damping device 20 and the external damping device 14, which is fastened between the stator outer sleeve 16 and the fixed mandrel 12 by the bolt 5.

[0036] Embodiment three:

[0037] Please refer to Figure 4 wherein the stator outer sleeve 16 is arranged in an integrated inner sleeve and outer sleeve type, the left end of the stator outer sleeve 16 is arranged in a stepped type, the thread line on the outer surface of the left end of the inner sleeve is matched with the sealing cover 4, the right end of the outer sleeve of the stator outer sleeve 16 is threaded, and the sealing of the cooling liquid is realized by cooperation with the outer sealing cover 10; further, the threaded holes are arranged at both ends of the inner sleeve and the outer sleeve of the stator outer sleeve 16, and the internal damping device 20 and the external damping device 14 are fixed by the bolt connection. The stator outer sleeve is engraved with a metal engraved groove bearing, wherein the radial bearing is engraved with a chevron groove, and the thrust bearing is engraved with a spiral groove, and the liquid metal lubrication is matched with the rotor, the liquid metal has low volatility and good vacuum compatibility, and further, the liquid metal engraved groove bearing has small friction loss, and the service life of the bearing can be significantly improved compared with the traditional ball bearing.

[0038] The above embodiments only illustrate the basic principles and structure of the present application, and the present application is not limited to the above embodiments, and various changes and changes are made to the present application, and these changes and changes fall within the scope of the present application.

[0039] The present application can be widely applied to the technical field of CT tube.

Claims

1. A fixed core mandrel damped CT tube comprising a tube housing (1) comprising an anode target disk (2) and a cathode (21) inside, the CT tube comprising a rotating part, characterized in that: The rotating part comprises a rotor (3), a fixed mandrel (12), a motor stator (7), and a stator outer sleeve (16), the rotor (3) is connected with the anode target disc (2) through fasteners, the motor stator (7) is arranged outside the bulb shell (1) and corresponds to the position of the rotor (3), and the rotor (3) is sleeved outside the stator outer sleeve (16); the stator outer sleeve (16) is provided with an internal damper (20), a middle damper (17), and an external damper (14) between the stator outer sleeve (16) and the fixed mandrel (12).

2. The CT tube of claim 1, wherein, The rotor (3) and the stator outer sleeve (16) are provided with a radial bearing (19) and a thrust bearing (9), the rotor (3) and the stator outer sleeve (16) are matched through the thrust bearing (9) and the radial bearing (19); the thrust bearing (9) is engraved with a spiral groove, and the radial bearing (19) is engraved with a herringbone groove; the rotor (3) and the stator outer sleeve (16) are lubricated by liquid metal and sealed through a sealing ring (15).

3. The CT tube of claim 1, wherein, The internal damper (20) and the external damper (14) are fixed on the fixed mandrel (12) and the stator outer sleeve (16) through one or more bolts, and the extension direction of the bolts is parallel to the rotor axis; the middle damper (17) is fastened on the fixed mandrel (12) through a nut and a snap spring (18), and the snap spring (18) limits the axial displacement of the middle damper (17); wherein the stator outer sleeve (16) and the fixed mandrel (12) are provided with threaded holes for installing the bolts (5), and the fixed mandrel (12) is provided with external threads for matching the nut (6).

4. The CT tube of claim 1, wherein, The stator outer sleeve (16) and the fixed mandrel (12) are provided with a cooling device; the cooling device comprises a cooling working medium inlet (13) and a cooling working medium outlet (11); the cooling working medium enters from the cooling working medium inlet (13) and flows out through the cooling working medium outlet (11) after circulation.

5. The CT tube of claim 4, wherein, The stator outer sleeve (16) is sealed to the cooling working medium through an inner sealing cover (4) and an outer sealing cover (10).

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